Buying BB accessories from third parties (like this one)

I've just purchased the Tour 9630 and want to buy some basic accessories. I want them to be actual BlackBerry branded (or BlackBerry-made) items or at least 100% dependable as having identical specs since these are electronic charging-related items and I don't want to deviate from factory specs.

Three items I'm looking at are available at CrackBerry.com and show the BB logo on the images: